What are status codes in HTTP?

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HTTP status codes are standardized 3-digit responses that a server sends to indicate the result of a client's request. They help the client understand whether the request was successful, failed, or needs further action.

🔢 Status Code Categories:

1. 1xx – Informational
   The request was received, and the process is continuing.

   • Example: 100 Continue

2. 2xx – Success
   The request was successfully received and processed.

   • 200 OK: Standard response for a successful request

   • 201 Created: A new resource has been created

   • 204 No Content: Success, but no content to return

3. 3xx – Redirection
   Further action is needed to complete the request.

   • 301 Moved Permanently: Resource moved to a new URL

   • 302 Found: Temporary redirection

   • 304 Not Modified: Resource hasn’t changed since last request

4. 4xx – Client Errors
   The request has bad syntax or cannot be fulfilled by the server.

   • 400 Bad Request: Malformed request

   • 401 Unauthorized: Authentication required

   • 403 Forbidden: Access denied

   • 404 Not Found: Resource not found

5. 5xx – Server Errors
   The server failed to process a valid request.

   • 500 Internal Server Error: Generic server error

   • 502 Bad Gateway: Invalid response from upstream server

   • 503 Service Unavailable: Server is temporarily unavailable

✅ Summary:

HTTP status codes provide critical feedback about the result of a request, helping developers and clients understand what went right or wrong in a web interaction.

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